Results 241 to 250 of about 70,444 (281)

Pilot Study on Nanofiltration Process for Surface Water Treatment and Optimization in Northern Jiangsu Region. [PDF]

Membranes (Basel)
Jin J, He S, Zhang T, Xia S.
europepmc   +1 more source

On Flux-Difference Residual Distribution Methods

Bulletin of the Malaysian Mathematical Sciences Society, 2017
It is well known that residual distribution methods are less sensitive to mesh variations, in contrast to finite volume methods. However, in most cases, most of the residual distribution methods are just first order accurate in space for unsteady calculations while the same methods are higher order accurate for the corresponding steady-state problems ...
Ismail, Farzad, Chang, Wei Shyang, Chizari, Hossain   +2 more
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Electromigration and Flux Residues

ECS Transactions, 2021
Electromigration and its subcategory electrochemical migration is a serious problem in electronic industry working with printed circuit boards (PCB). Smaller equipment with high density of interconnection (HDI) is assembled with surface mounted devices (SMD) and through hole components (THC) Assembly techniques are realised mainly by soldering process ...
Jiri Stary, Petr Vanysek, Vitezslav Novak   +2 more
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What Makes No-Clean Flux Residue Benign?

Pan Pacific Symposium, 2016
ABSTRACT Since the conversion to lead-free solders, no-clean flux has become the predominate flux used in electronic card assembly and test (ECAT) manufacturing. No-clean flux performs well and can save steps in manufacturing. If used properly, no-clean flux can be effective, safe and reliable.
Phil Isaacs, Terry Munson
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Assessment of Solder Flux Corrosivity and Flux Residue Level in Clip Bonding Assembly

International Symposium on Microelectronics, 2021
Abstract Most fluxes and their flux residue are corrosive, and their presence on the surface of assemblies may cause reliability concerns due to electrochemical migration. This study firstly refers to the test method IPC-TM-650 2.3.32D and 2.6.15C and the requirements in J-STD-004A to evaluate flux-induced corrosion and the corrosivity ...
Fred Fuliang Le, Haibin Chen, Zunyu Guan, Francis Louise Fajardo   +3 more
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Characterising the Corrosion Properties of Flux Residues

Soldering & Surface Mount Technology, 1991
A new corrosion test for assessing flux residues is applied to marginally cleaned water soluble fluxed test boards and low solids/no clean fluxed test boards. This test method developed by Bono has been modified to accelerate the corrosion process. The corrosion mechanism observed in this study is conductive anodic filament (CAF), a corrosion mechanism
L.J. Turbini, G.B. Freeman, M.H. Smith, J.D. Finney, R.D. Boswell, J.F. Lane   +5 more
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Characterising the Corrosion Properties of Flux Residues

Soldering & Surface Mount Technology, 1992
Today's emphasis on alternative flux technology as an approach to eliminate the use of chlorofluorocarbons (CFCs) requires an understanding of the corrosion potential of the new fluxes. In 1989, Dr David Bono proposed that monitoring the effect of different soldering fluxes on the rate of corrosion of a copper wire printed on a circuit board would ...
L.J. Turbini, J. Schodorf, J. Jachim, L. Lach, R. Mellitz, F. Sledd   +5 more
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Minimizing Flux Residues on the Component Body

SMTA International, 2005
ABSTRACT This paper presents the methods researched and implemented to minimize flux residues on the component body. No-clean solder pastes have the tendency to leave flux residues. Although these residues do not lead to any defects, their presence on the board or component body is aesthetically unappealing.
Deepak Manjunath, Satyanarayan Iyer, Shawn Eckel, Du Le, Purushothaman Damodaran, Krishnaswami Srihari   +5 more
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Research on Residual Flux Prediction of the Transformer

IEEE Transactions on Magnetics, 2017
The complete inrush current elimination depends on the veracity of the residual flux prediction for transformers. The precedent methods cannot satisfy the increasingly strict engineering requirements. Considering the chopping current and shunt capacitor influence on residual flux, a method for predicting residual flux based on the dynamic Jiles ...
Yang Wang, Zhizhen Liu, Hongxing Chen
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Control of Residual Flux in Current Transformers

IEEE Transactions on Power Apparatus and Systems, 1973
This paper provides additional data about residual flux in current transformers including evaluation of the effect on metering and relaying performance, and methods of measurement and control.
E. Conner, R. Greb, E. Wentz
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